Machines for tunneling wedge heel blocks



May 16, 1961 E. E. JOINER MACHINES FOR TUNNELING WEDGE HEEL BLOCKS 7 Sheets-Sheet 2 Filed June 3, 1957 Invenfor Edgar E 717027267 May 16, 1961 E. E. JOINER MACHINES FOR TUNNELING WEDGE HEEL BLOCKS 7 Sheets-Sheet 5 Filed June 3, 1957 Inventor EdgarE Joiner By his May 16, 1961 E. E. 'JOINER MACHINES FOR TUNNELING WEDGE HEEL BLOCKS 7 Sheets-Sheet 4 Filed June 3, 1957 Inventor Edgar E Joiner- B l all,

May 16, 1961 E. E. JOINER MACHINES FOR TUNNELING WEDGE HEEL BLOCKS 7 Sheets-Sheet 5 Filed June 3, 1957 Inventor Edgar- E T/Bz'rzer' y 1961 E. E. JOINER 2,984,271

MACHINES FOR TUNNELING WEDGE HEEL BLOCKS Filed June 3, 1957 7 Sheets-Sheet 6 By Hey May 16, 1961 E. E. JOINER MACHINES FOR TUNNELING WEDGE HEEL BLOCKS 7 Sheets-Sheet 7 Filed June 3, 1957 @NQ QNQ QR Qvm Inventor Edgar- E'. Joinerhi United States Patent MACHINES FOR TUNNELING WEDGE HEEL BLOCKS Edgar E. Joiner, Andover, Mass., assignor to Fred W.

Mears Heel Company, Inc., Lawrence, Mass, :1 corporation of Massachusetts Filed June 3, 1957, Ser. No. 663,027

9 Claims. (Cl. 144-143) This invention relates to machines for use in the manufacture of wedge heels and more specifically to machines for forming tunnels in wedge heel blocks.

In the manufacture of wedge heels it is common practice to form at the forward or shank part of the bottom of the wedge heel block an arch which extends transversely of the block and is commonly referred to as a tunnel, said arch serving to style the wedge heel which is formed from the block and to render more attractive the shoe to which the heel is attached.

It is common practice to tunnel wedge heel blocks by moving them transversely past a cutter, which is rotatable about an axis, and generally lengthwise of said axis. Such practice although fairly satisfactory has its drawbacks because of the tendency to chip or splinter the blocks. Moreover, the lengthwise curvature of the tunnel when formed by this practice is complemental to the curvature of the locus of the cutting edges of the cutter and if different tunnel curvatures are to be obtained it is necessary to change cutters, said curvatures being at all times circular.

Wedge heel blocks are also tunneled by the use of wood heel turning machines which are well known in the art, the tunneling cuts progressing lengthwise of said blocks and the curvatures of said-tunnels being variable. Such practice necessitates that the tunneling operation shall be performed before the wedge heel block is turned in view of the difliculties in clamping and positioning wedge heel blocks in converted turning machines after the blocks have been turned. When wedge heel blocks are tunneled prior to their being turned the heel block damage during the subsequent turning operation is very high. Moreover, when unturned wedge heel blocks are turned by turning machines it has been found that there is considerable tendency to tear out orsplinter the fibres because of the fact that there is no provision in such machines for backing up the fibres at the place where the cutting edges of the cutter leave the work.

It is an object of the present invention quickly and elfectively to form in wedge heel blocks of different sizes and/ or styles tunnels of a wide variety and shapes without danger of splintering said blocks and with a minimum amount of efiort on the part of the operator.

With the above object in view and in accordance with a feature of the present invention there is provided a Wedge heel block tunneling machine comprising a cutter rotatable about an axis, guiding means, a carrier mounted upon said guiding means for movement in opposite directions in a path disposed at substantially right angles to the axis of the cutter, means for positioning a heel block on the carrier, power means for clamping the positioned heel block to the carrier, power means operative in response to clamping movement of the firstnamed power means for moving the carrier on said guiding means in opposite directions to cause the heel block to traverse the cutter whereby to form a tunnel in the forward part of the bottom of the heel block, and power means responsive to movement of the carrier on said guiding means for moving said guiding means to vary the path of movement of the carrier with relation to the cutter as it moves on said guiding means.

By the use of electrically controlled fluid pressure means hereinafter described the operation of the guiding means may be varied to effect three different sequences of operations of the machine, which operations may be selectively employed in accordance with the style of the wedge heel block to be operated. upon and the type of wood of which the block is constructed. When the illustrative machine is operated in accordance with sequence of operations No. l the guiding means is held stationary, the heel block mounted on the carrier being moved with relation to the cutter in the same path as it traverses the cutter in opposite directions. When the machine is operating in accordance with sequence of operations No. 2 the guiding means is moved toward and away from the cutter at the projected and retracted ends respectively of the path of movement of the carrier on said guiding means with the result that the tunnel is formed in the wedge heel block mounted on the carrier by roughing and finishing cuts respectively during movement of the carrier toward and away from the cutter. In sequence of operations No. 3 of the machine the guiding means is moved away from the cutter at the end of the projected stroke of the carrier on the guiding means with the result that the heel block, which is mounted on the carrier, after having been tunneled is spaced from the cutter during its movement back to its retracted position on the guiding means.

The carrier supports the wedge heel block by engagement with the attaching face of said block forced against the carrier by a clamp which is operated. by the abovementioned power means and is adapted, as the heel block is moved lengthwise and forward end first into the cutter, to engage the rear portion of the bottom of the block and to extend across said bottom just rearward of a line where the rear end of the tunnel to be formed is to join the bottomof the heel. By causing the wedge heel block to be clamped against the carrier as above described there is little likelihood of the heel block being splintered where the rear end of the tunnel breaks out at the bottom of said block.

The illustrative machine operates automatically, it being necessary for the-operator only to position, by the use of suitable breast and side gages mounted on the carrier, the block on said carrier. When the heel block has been positioned on the carrier the operator presses a knee pad causing in succession the heel block to be clamped to the carrier, the breast gage to be retracted on the carrier and the carrier to be moved on the guiding means traversingly past the cutter in a predetermined path and thereafter to return to its starting position on said gmiding means where the clamp is released from the heel block, the block is ejected from the carrier and the breast gage is moved to a block receiving station on the carrier which remains at rest ready for the next ccle of the machine. The guiding means upon which the carrier is mounted may be moved as above explained in. timed relation with the movement of the carrier on said guiding means to effect the tunneling of heel blocks which are especially susceptible to breakage, the operation of the guiding means being automatic. By the use of the above machine, wedge heel blocks of all styles may be quickly and effectively tunneled with a minimum amount of cost and damage.

The present invention consists in the above features and in novel features hereinafter described, reference being had to the accompanying drawings which illustrate one embodiment of the invention selected for purposes of illustration, said invention being fully disclosed in the following description and claims.

In the drawings,

Fig. 1 is a perspective view of the illustrative wedge heel block tunneling machine;

Fig. 2 is a front elevation, partly broken away and partly in section, of the machine;

Fig. 3 shows in perspective a wedge heel block carrier and a carrier support of the illustrative machine;

Fig. 4 shows in side elevation the portion of the machine illustrated in Fig. 2;

Fig. 5 is a perspective view showing knee operated mechanism for use in starting the machine through its cycle of operations;

Fig. 6 is a front view of a portion of the wedge heel block carrier with a heel block mounted thereon and mechanism for positioning said block on the carrier;

Fig. 7 is an end view on the line VII-VII of Fig. 6 of mechanism for positioning the wedge heel block on the carrier;

Fig. 8 shows in plan the carrier and the mechanism shown in Fig. 6, the heel block shown in Fig. 6 having been removed;

Fig. 9 is an illustrative view showing a slightly modified heel block carrier and carrier support;

Figs. 10 and 11 are side and perspective views respectively showing the wedge heel block before and after being tunneled; and

Fig. 12 is a combined fluid pressure mechanism and wiring diagram for use in describing the operation of the machine.

The illustrative machine is described with reference to forming a tunnel 30 (Figs. 2, 6 and 11) in the bottom 32 of an untunneled wedge heel block 34 adjacent to a breast face '35 of said block, whereby to form a tunneled wood heel block 3411, and comprises a carrier 36 upon which the heel block is positioned and clamped, means comprising a support or unit 38 and a guideway 40 (Figs. 2 and 4) cooperating with the support to control movement of the carrier in a predetermined path, a cutter or tool 42 mounted for rotation about a fixed axis 44 and air powered means 46 (Fig. 2) for moving the carrier 36 in said path to cause the cutter to trim material from the block whereby to form said tunnel. As will be hereinafter explained, at the end of a stroke of the carrier 36 from its retracted position on the support 38, the support may be maintained stationary with the result that the carrier 36 is moved back to its retracted position in the same path, or the support may be raised vertically before being retracted thereby causing additional material to be trimmed from the wedge heel block 34 by a finishing cut as the heel block is moved back to its retracted position. Moreover, in tunneling some types of wedge heel blocks 34 it has been found desirable to lower the support 38 and accordingly the carrier 36 and the heel block 34 mounted on it with relation to the cutter 42 at the end of the projected stroke of the carrier on the support and preparatory to moving the carrier back to its retracted position on said support.

The cutter 42 is mounted on a shaft 37 of an electric motor 39 secured to a slide plate 41 vertically adjustable in a vertical dovetail channel 43 of a guide 45 which has a rear dovetail projection (not shown) fitting in a horizontal dovetail guideway 47 of a supporting bracket 49 bolted to a main frame 54. The guide 45 has ro tatably mounted on it an adjusting screw 51 threaded into the slide plate 41 and the bracket 49 has rotatably mounted on it an adjusting screw 53 threaded into the guide 45, the construction and arrangement being such that the motor 39 and accordingly the cutter 42 may be initially adjusted heightwise of the machine and forward and rearward of said machine.

Secured by screws 50 (Figs. 2 and 4) to an angle bracket 52 forming part of the main frame 54 of the machine is a vertically arranged cylinder 56 in a bore 58 of which is slidingly mounted a piston 60 having secured to it a piston rod 62 passing upward through an opening 64 in said bracket and pivotally connected to a coupling pin 66 secured to spaced flanges of the support 38 which is slidingly mounted in a vertical guideway 68 formed in part by the main frame 54 and partly by gibs 70 secured by screws 72 to the main frame. The support 38 comprises a supporting block 74 having formed in it a notch 76 adapted to receive a main cam 78 which has threaded into it an adjusting screw 80 journaled on a lug 82 secured by screws 84 to the block. The supporting block 74 also has formed in it a stepped back notch 86 adapted to receive a run-off cam 88 which horizontally overlaps the main cam 78. The main cam 78 has extending horizontally through it slots 90 in which register screws 92 threaded into the supporting block 74 and having heads thereof forced against the main cam to maintain this cam in its adjusted position on the supporting block. The run-ofi cam 88 is secured to the supporting block 74 by screws 94 passing through bores in this cam and threaded into the block. The operating position of the main cam 78 lengthwise of the notch 76 may be varied by first releasing the set screws 92 and turning the adjusting screw 80, the set screws 92 thereafter being tightened to maintain the main cam 78 in its adjusted position. The upper surfaces of the illustrative main cam 78 and the run off cam 88 are flat. However, if desirable, the upper surface of the main cam, which surface controls the path of movement of the carrier 36 upon the support or unit 38, may be modified for example as is the upper surface of the modified main cam 78a hereinafter referred to. Any change in the shape of the upper face of the cam 78 will change the longitudinal contour of the tunnel 30 formed in the wedge heel block 34.

Arranged vertically above the guideway 68 is a vertical guideway 96 which is formed in part by the main frame 54 and partly by gibs 98 (Fig. 4) secured by screws 100 to the main frame 54 and which is adapted to receive slidingly a dovetail portion of a bearing block 102 provided with the above-mentioned guideway 40. Secured by screws 104 to the bearing block 102 are impulse switches 106, 108 having plungers 110, 112 which cooperate with a striker plate 114 secured by screws 115 to the carrier 36 to effect the releasing of a clamp 116 and certain vertical movements hereinafter referred to of the support 38.

The carrier 36 has a rear dovetail portion adapted slidingly to fit in the guideway 40 of the bearing block 102 and journaled on a bearing pin 118 secured to the carrier is a roll 120 which at all times is in forced engagement with upper surfaces 122 and/or 122a of the main cam 78 and the run-off cam 88 respectively. The roll 120 is forced against the surfaces 122, 122a of the main cam 78 and the run-off cam 88 by a pair of springs 124, 12411 the lower ends of which are attached to extensions 126, 126a secured to the supporting block 74 and the upper ends of which are attached to screws 128, 128a adjustably secured to extensions 130, 130a of the bearing block 102. Secured by screws 132 to the lower portions of the carrier 36 are pans 134 which reduce to a minimum the amount of sawdust which is deposited upon the cams 78, 88.

Secured by screws 136 to the carrier 36 are gibs 138 which form with a face of the carrier a guideway 140 adapted to receive a dovetail portion of an L-shaped member 142 having an arcuate bearing bed 144 and having threaded into it an adjusting screw 146 which is journaled in a notch of a plate 150 secured by screws 152 to a block 154 and adapted to move the L-shaped member in different adjusted positions along the guideway in accordance with the desired length of the tunnel 30. The L-shaped member 142 may be clamped in different adjusted positions to the carrier 36 by a clamp bolt 155. The block 154 is secured by screws 156 to a binder plate 158 secured by screws 160 (Fig. 2) to the carrier 36, the L-shaped member 142 being moved into different ad usted positions in the guideway 140 of the carrier 36 in response to rotation of the screw 146. Mounted upon the L-shaped member 142 is an arcuate block 162 which has a cylindrical bottom face complemental to and slidingly fitting on the arcuate bed 184 of the L-shaped member *142, cylindrical elements of said facesbeing centered about a horizontal axis 164 (Figs. 2, 3 and 4) hereinafter referred to. Formed in the arcuate block 162 is a slot 166 upper and lower concentric faces of which are centered about the axis 164, said slot being adapted to receive a clamp screw 168 which is threaded into an up standing portion of the L-shaped member and has a head thereof adapted to be forced against the front face of the arcuate block to retain this block in its adjusted position on said member.

Mounted in a channel 170 formed in the upper face of the arcuate block 162 is a :bar 172 secured by screws 174 (Figs. 6 and 8) to a multipartgage holder 176 adapted to support lip and breast gages 178, 180, hereinafter referred to, said'bar having formed in it a slot 182. Mounted in guideways 184 formed in the upper surface of the arcuate block 162 above the channel 170 is a wedge heel block bearing or work plate 186 which has a pair of vertical counter-sunk bores 188 and an upper or work-engaging portion of which is formed by a plurality of V-shaped teeth 190. The bar 172 and the bearing plate 186 may be secured to the arcuate block 162 by screws 192 which pass respectively through the bores 188 and the slot 182 in the plate 186 and the bar 172 and are threaded into said block, the bar being adjustable lengthwise of the channel 170 in accordance with the length of the wedge heel block 34 to be accommodated. As will be hereinafter explained, hearing or work plates 186 of different sizes and shapes, as best shown in Figs. 6 and 9, may be interchangeably substituted for one another in accordance with the size and/or style of the wedge heel block 34 being operated upon.

Secured by screws 194 to the multipart gage holder 176 is a flanged housing 196 in a bore 198 (Figs. 2, 6 7 and 12) in which a piston 200 is reciprocable, said piston having secured to it a connecting rod 202 the upper end of which is secured to a slide 204 movable in a passage 206 of the holder alongside the lip gage 180. One of the flanges of the flanged housing 196 has extending through it an opening 208 affording access for a screw 210 which extends through a vertical slot 212 formed in the lip gage 178 and is threaded into the holder thus serving to secure the lip gage in its initially adjusted position to the holder. Secured by screws 214 to the upper end of the slide 204 is the breast gage 180 which is preferably made of fibre and when the machine is idle and the breast gage is in its raised or dash-line block receiving position has a face 180athereof extending a substantial distance above a work-engaging or supporting face 178a of the l-ip'gage 178. It will be noted at this point that when the wedge heel block 34 is positioned in the machine the breast gage 180 is in its raised dashline posit-ion (Fig. 6) and that before the carrier 36 starts to move toward the cutter 42 this gage is retracted to approximately its full-line position.

As will be hereinafter explained, when the wedge heel block 34 has been placed upon the work plate 186 with the forward portion of its bottom 32 in engagement with the lip gage or rest 178 and its breast face 35 in engagement with the breast gage 180, the above-mentioned holddown clamp 116 is brought into engagement with the bottom face 32 of the heel block and immediately thereafter the breast gage 180 is lowered by mechanism hereinafter described to insure against its being cut off by the cutting tool during the tunnel-forming movement of the carrier.

The wedge heel block 34 is positioned widthwise on the work plate 186 of the carrier 36 by the use of a side gage 21 6 (Figs. 3, 4, 6 and 9) shaped and arranged to be engaged by the side of the rim of an attaching face 218 of the heel block positioned on said plate with its breast face 35 in engagement with the breast gage 180. The side gage 216 may be quickly and effectively secured in different adjusted positions to the carrier 36 by the use of a set screw 220, the operative position of the side gageon the carrier for a heel of a given size and/or style being readily determined by the use of suitable calibrations 222 (Fig. 4) on said gage.

In order to eject'the tunneled wedge heel block 34a from the carrier 36 after said carrier has returned to its retracted position upon the support 38 'there is provided an ejector 224 (Fig. 6) which is secured by a screw 226 to a piston rod 228 threaded into a piston 230 slidingly mounted in a bore 232 formed in the L-shaped member 142. The piston 230 is constantly urged, by a spring 234, to a lowered or retracted position in the bore 232, in which position the ejector 224 is below the level of the upper face of the work plate 186. As will be explained later, high prmsure air is supplied to a passage 236 in the L-shaped member 162 from a line 238 leading to a port 240 (Fig. 12) of a solenoid valve 242 which is responsive to movement of the carrier 36 back to its retracted position on the support 38.

The carrier 36 is moved in a predetermined path between its retracted starting position shown in Fig. 2 and its projected position in which the wedge heel block is moved its maximum distance into the cutter or tool 42, by a piston rod 244 one end of which is mounted on a coupling pin 246 (Figs. 2 and 4) secured to the carrier. The other end of the piston rod 244 is secured to a piston 248 (Figs. 2 and 12) reciprocable in a bore 250 of a cylinder 252 pivoted upon a fulcrum pin 254 mounted on an upstanding bracket of the main frame 54.

The carrier 36 is provided with an upstanding flange portion 36w (Figs. 2 and 4) having threaded into it a shoulder screw 256 which is centered about the axis 164- and has journaled on it a bracket 258. Formed in the upstanding flange portion 36a of the carrier 36 is a pair of concentrically arranged slots 260 which are centered about the axis 164 and have extending through them a pair of clamp bolts 262 threaded into the bracket 258 which may be initially secured in one of a plurality of different angularly adjusted positions upon the carrier 36 by the use of said clamp bolts.

The bracket 258 has formed in it a guiding notch 264 the upper end of which is bridged by abar 266 secured by screws 268 to the bracket. Slidingly mounted for movement heightwise along the notch 264 is a slide plate 270 having threaded into it a thumb screw 272 provided with a collar journaled on the bar 266 and adapted to move the plate into different operating positions along said notch.

Secured to the slide plate 270 by screws 274 (Fig. 4) is a retaining plate 276 lateral portions of which are in engagement with a face 278 of the bracket. The slide plate 270 has formed integral with it a retaining portion 280 which is adapted to engage a face 282 of the bracket 258 and secured by screws 284 to said retaining portion are gibs 285 forming between them a dovetail guideway 286 (Fig. 2) for slidingly receiving a dovetail portion of the clamp 116. r

The retaining portion 280 of the slide plate 270 has secured to it by screws 288 -a ledge 290 which has bolted to it an air cylinder 292 having a bore 294 in which a piston 296 is slidable. Threaded into the piston 296 is a piston rod 298, which is threaded into the upper end of a mount portion 299 of the clamp 116, a locknut 300 serving to insure that the piston rod shall not rotate with relation to the clamp. The clamp 116 is secured by countersunk screws 304 to a holder plate 302 which is of angular outline. The holder plate 302 has threaded into it a plurality of screws 306 '(Fig. 2) which pass through a slot 310 formed in a wooden presser member 308 which serves to clamp the presser member against'the bottom 32of'the wedge heel block 34. 'In order'to back up .fibres of the wedge heel block 34 it is essential that the presser member 308 shall bear upon the heel block where blades of the'cutter leave the heel block and accordingly before tunneling a heel block of a given size and/ or style the presser member extends beyond the position Where the tunneling cuts break out into the bottom 32 of the heel block, a forward portion of the presser member being trimmed during the tunneling of the first block of a given size or style.

The machine is started through its cycle of operations in response to actuation of the plunger 312 (Figs. 1, and 12) of an impullse switch 314 operated by mechanism which will now be described. The plunger 312 of the impulse switch 314 is conveniently operated by swinging counterclockwise, as viewed in Figs. 1 and 5, against the action of a spring 316, a knee pad 318 secured to an arm 320 which is pivotally mounted on a flange of an angle bar 324 welded to the main frame 54. The impulse switch 314 and an impulse switch 326, which is hereinafter referred to and has a plunger 328 are secured to the angle bar 324 which has adjustably secured to it a block 330 (Fig. 5) carrying a spring biased plunger 332 adapted to be moved into a hole 334 formed in a lug 336 secured to the arm 320 when the plunger is turned about its axis and is allowed to fit in a slot, whereby to prevent movement of said arm while repairs or adjustments are being made in the machine. Counterclockwise move ment of the arm 320, as viewed in Fig. 5, is limited by the engagement of a nut 338 threaded onto a screw 340, which is carried by the arm and passes through a hole 342 in a depending flange of the angle bar 324, with one side of said flange; clockwise movement of the arm as viewed in Fig. 5, under the action of the spring 316 being limited by the engagement of a nut 344 which is threaded onto the screw 340, with an opposite side of said flange.

Operation In the use of the illustrative machine the operator places the wedge heel block 34 on the work plate 186 of the carrier 36, the attaching face 218 of the block being in engagement with the work plate and the lip gage or rest 178 and the side of the rim of the attaching face of the block being in engagement with the side gage 216, which serves to position the block widthwise on the work plate, and the breast face 35 of the heel block being in engagement with the breast gage 180 to position the block lengthwise on the work plate and the lip gage.

The machine is powered by closing a power switch 341 (Fig. 12) connected to a primary coil 343 of a transformer 347 comprising a secondary coil 349 one end of which is grounded and the other end of which is connected to various feed lines supplying power for controlling the operation of various air operated mechanisrns hereinafter described.

The operator then swings the knee pad 318 counterclockwise (Figs. 1 and 5) causing through mechanism above described terminals of the impulse switch 314 to be bridged and a coil 345 of a solenoid valve 348 to be energized wtth the result that a solenoid slide 346 of this valve is moved to a projected dash-line position (Fig. 12) from its retracted or full-line position. When the machine is idle, the solenoid slide 346 being in its full-line retracted position, a passage 350 of this slide connects a 'high pressure air line 352 with a passage 354 of the cylinder 292, air from this line being available for a face 356 of the piston 296 thereby maintaining the piston and accordingly the clamp 116 in its raised position limited by the engagement of the piston with the upper end of the cylinder, an exhaust passage 358 of the slide 346 at this time being open to a face 362 of the piston 296. When the solenoid slide 346 has been moved to its dashline or projected position, air from the high pressure line 352 passes through the passage 350 of the slide, through a passage 3600f the cylinder 292 and is thus available for the. face 362 of the piston 296, the face 356 of said piston then being open to an exhaust passage 358a. Accordingly the clamp 116 is lowered to force the Presser member 308 against the bottom 32 of the wedge heel block 34 which is to be tunneled.

Secured by screws 364 (Fig. 2) to one of the gibs 285 (Figs. 2 and 4) is a plate 366 having secured to it by screws 368 a pilot valve 370 (Figs. 2, 4 and 12). Secured by screws 372 to the mount portion 299 of the clamp 116 is a cam 374 which during downward movement of the clamp operates against a plunger 376 (Fig. 12) of the pilot valve 370 causing air from a high pressure line 352a to be admitted to a line 380 having interposed in it a time delay valve 382 communicating with a face 384 of a piston 386 slidable in a cylinder 388, said piston being constantly urged to the left (Fig. 12) by a spring 390. Movement of the piston 386 to the right (Fig. 12) causes a plunger 392 of an impulse switch 394 to be moved across contacts of this switch and accordingly energizes a coil 396 of a solenoid valve 398 and thus causes a solenoid slide 400 of this valve to be moved from its retracted or full line position shown in Fig. 12 to its projected or dash line position. When the solenoid valve 400 is in its full line retracted position a passage 402 in this slide is open to a high pressure line 3521; and also to a passage 404 in the housing 196, high pressure air at this time being available for a bottom face 406 of the piston 200 to maintain the breast gage in its raised or idle block receiving position determined by the engagement of the piston 200 with the upper end of the housing, and exhaust passage 408 of the solenoid slide 400 at this time being open to a passage 410 in said housing and thus being open to an upper face 412 of the piston.

When the solenoid slide 400 is in its projected or dash-line position the passage 402 in said slide is open to the high pressure line 352b and to the passage 410, and an exhaust passage 414 of the solenoid slide 400 is open to the passage 404 in the housing 196, high and low pressure air being available for the faces 412, 406 respectively of the piston 200 to cause said piston to be moved to its lowered position determined by its engagement with the lower end of said housing. Accordingly, the breast gage 180 is moved from its raised or heel block receiving dash-line position of Fig. 6 to its lowered or retracted full-line position in response to'movement of the piston 200 to its lowered position.

As the breast gage 180 is lowered an arm 416 carried by the piston rod 202 is moved against a plunger 418 of an impulse switch 420 causing the bridging of terminals of this switch and accordingly through a closed switch 422, hereinafter referred to, energizing a coil 424 of a solenoid valve 426 and thus effecting movement of a slide 428 of this valve from its full-line retracted position shown in Fig. 12 to its projected dash-line position. When the slide 428 is in its dash-line position a passage 430 of this slide communicates with a high pressure line 352c and with a passage 432 in the cylinder 252, and an exhaust passage 434 of the solenoid slide is open to a passage 435 of the cylinder and accordingly to a face 436 of the piston 248, high pressure air at this time being available for a face 438 of the piston and accordingly the carrier 36 moving to the left (Figs. 2 and 12) to cause the wedge heel block 34 positioned and clamped on the carrier 36 to traverse the cutter 42 whereby to form the tunnel 30 in said block.

The carrier 36 continues to move the wedge heel block 34 into the cutter 42 until the striker plate 114 mounted on the carrier moves a plunger 440 of'an impulse switch .41 across terminals of this switch causing, through a switch 442 terminals 443 of which at this time are bridged by a plunger 444, a coil 446 of the solenoid valve 426 to move the solenoid slide 428 back to its retracted or full line position shown in Fig. 12, thereby causing the passage 430 of the slide to move into alinement with the passage 435 of the cylinder 252, an exhaust passage 450 of the slide 428 then being open to the passage 432 with the result that air at high and low pressures respectively is available for the faces 436, 438 of the piston 248 to return said piston to its retracted position determined by .ingly causing passages 350, 358 to register respectively with passages 354, 360 of the cylinder 296 with the re-- sult that the piston 2% moves the clamp 116 to its raised starting position determined by the engagement of the upper end of said piston with the cylinder.

The clamp 116 has operatively connected to it a striker plate 454 which, in response to elevation of the clamp, elevates a plunger 456 of an impulse switch 458 which is secured (Figs. 2 and 4) to a plate mounted on the pilot valve 370, causing terminals of this switch to be bridged to energize a coil 460 of the above-mentioned solenoid valve 242. The solenoid valve 242 has a bore 464 and a solenoid slide 466 which has a passage 468 and is movable in said bore, said slide being normally held against a face 470 of this valve by a coil spring 472. The solenoid valve 242 also has formed in it a port 474 leading to an exhaust line 476 and a port 478 leading to a high pressure line 480 as well as the above mentioned port 240 leading to the line 238 extending into the passage 236 which is open to a bottom face 486 of the piston 230 which as previously explained is secured to the ejector 224. When during upward movement of the clamp 116, the plunger 456 of the impulse switch 458 is engaged by the striker plate 454, the coil 460 of the solenoid valve 242 is energized thereby causing the slide 466 to move into a position in which its passage 468 is open to the port 478 and accordingly high pressure air is available for the line 238 and for the face 486 of the piston 230 with the result that the ejector 224 is raised against the action of the spring 234 to eject the tunneled wedge heel block 34a, which has already been unclamped, from the machine, said block being knocked into a chute (not shown) and from there into a container (not shown).

After the coil 460 of the solenoid valve 242 has been de-energized the slide 466 of this valve moves back to its retracted position against the face 470 under the action of the spring 472, thereby moving the passage 468 of said slide 466 into alinement with the exhaust port 474 and accordingly opening the face 486 of the piston 230 to exhaust with the result that the ejector 224 is moved to its lowered retracted position by its associated spring 234. Just after striking the plunger 456 of the impulse switch 458 the striker plate 454 engages a plunger 481 of an impulse switch 483 causing a coil 485 of the solenoid valve 398 to be energized and accordingly the solenoid slide 400 to be moved back to its full-line position shown in Fig. 12 and the piston 200 to be moved to its raised position thereby moving the breast gage 180, which is secured to said piston, to its block receiving position.

As the carrier 36 reaches its retracted position on the support 38 the striker plate 114 secured to the carrier also engages the plunger 112 of the impulse switch 108 wired to a terminal 492 of a selector switch 494 comprising a lever 496, which is pivotally connected to said terminal, and terminals 498, 500. When the machine is operated on its normal cycle or sequence of operations No. l the supporting block 74 is held in its raised position during successive operations of the machine in which event the lever 496 of the selector switch 494 is in a position spaced from the terminals 498, 500.

t As will be explained later, the supporting block 74 is commonly initially moved to a predetermined elevated.

position and retained there during successive operations of the machine set for its normal cycle, in which event the carrier 36 and the work mounted on it usually reciprocates toward and away from the cutter in a fixed substantially constant path. Should it be desired to operate the machine exclusively as just described it will be apparcut that the supporting block 74 may be mounted on a solid bed (not shown) which is initially adjusted into different heightwise positions along a vertical guideway (not shown) by suitable mechanism.

In view of the fact, however, that in operating upon some types of wedge heel blocks 34 it is desirable slightly to raise the carrier 36 and accordingly the wedge heel block as said carrier reaches the limit of its movement away from its retracted position on the support 38 whereby to remove material from the wedge heel block by a finishing stroke as the carrier returns to its retracted position on said support, the supporting block 74 is illustrated as mounted upon and as having its vertical position controlled by the piston rod 62 of the piston 60 the operation of which may be varied in accordance with the setting of the selector switch 494 depending upon whether the machine is to be operated through its cycles or sequences of operations of operations 1, 2 or 3.

As above explained, in addition to the normal cycle or sequence of operations No. l of the machine, the machine may be operated through the cycle or sequence of operations No. 2 which may be referred to as the roughing and finishing cycle and during which the wood heel block is rough trimmed as it is moved into the cutter and is finish trimmed as it is moved out of the cutter. In operating upon wedge heel blocks 3-4 having thin laterally projecting lips which are easily splintered the carrier 36 may be advantageously lowered vertically away from the cutter 32 upon reaching the end of its stroke toward the cutter. When operating through sequences of operations Nos. 2 and 3 the carrier 36 is lowered and raised respectively when it has been moved to its retracted position on the support 38 to points below and above its starting position, said carrier having what is commonly referred to as a four-way motion.

In order that the carrier 36 may be moved selectively through any of its cycles or sequences of operations 1, 2 or 3 the supporting block 74 upon which the main and the run-off cams 78, 88 are mounted, is operatively connected to the connecting rod 62 of the piston 60 as above described. As above noted, however, if only the normal cycle or sequence of operations No. 1 is to be carried out by the machine the supporting block 74 may be mounted on a base (not shown) adapted to be initially moved into difierent heightwise positions along a vertical guideway (not shown). As above explained, the cutter 42 and the motor 39 are initially adjustedras a unit to the desired position with relation to the path of movement of the carrier by the use of the adjusting screws 51, 53.

In order to locate the supporting block 74 in the proper heightwise position to support the carrier 36 during the sequence of operations No. l of the machine the piston 60 has depending from it a rod 502 having threaded onto it a nut 504 (Fig. '12). When the piston 60 is raised by fluid pressure means hereinafter described the nut 504 engages the bottom of the cylinder 56, the supporting block 74 at this time being properly arranged heightwise with respect to the initially adjusted cutter '42. It will be noted at this point that when the machine is to operate on its normal cycle or sequence of operations No. l the piston 60 may if desirable at all times remain in its lowered position in the cylinder 56, the cutter 42 being initially positioned to receive and operate upon the work.

In order to move the supporting block 74 to a raised active position in which it remains stationary during the sequence of operations No. l of the machine, the operator depresses a plunger 506 of a switch 508 so as to bridge terminals of this switch causing, through a switch 510, terminals 512 of which at this time are bridged by a plunger 514, a coil 516 of a solenoid valve 518 to be Interposed in the line 526 is a quick exhaust valve 530 which allows high pressure air to be conducted to the cylinder 56 but which allows air exhausted from the cylinder to be discharged directly to a low pressure line.

Theline 524 has interposed in it a time delay valve 532 and a spring-pressed plunger 534 adapted to operate a plunger 535 of an impulse switch 536 causing through a switch 538 terminals 540 of which at this time are bridged by a plunger 542, the coil 446 of the solenoid valve 426 to be energized. The energizing of the coil 446 at this time has no elfect on the slide 428 of the solenoid valve 426 since this slide is already in its full line position shown in Fig. 12.

When it is desired to lower the piston 60 and accordingly the carrier 36 preparatory to stopping the machine operating on its No. 1 cycle, the operator moves the plunger 506 across terminals of the switch 508 and moves the plunger 514 of the switch 510 across the terminals 540 of the switch 510 causing a coil 541 of the solenoid valve 518 to be energized with the result that the slide 51$ of this valve is moved back to its full-line position shown in Fig. .12.

As above explained, when the machine is set for sequende of operations No. 1 the lever 496 of the switch 494 is'in a position spaced from the terminals 498, 500,

said switch at this time being open. Accordingly, the

piston 60 will remain stationary in its raised position under the action of high pressure air until such time as the operator depresses the plunger 514 of the switch 510 across terminals 540 of this switch and simultaneously therewith depresses the plunger 506 of the switch 508 across terminals thereof.

7 When the machine is idle the slide 520 of the solenoid valve 518 is in its position shown in Fig. 12, the line 524 being open to an exhaust line 543 and a line 544 leading to the solenoid valve 518 being connected by a line 546 to an upper face 548 of the piston 60 which is then held down against the lower end of the cylinder 56. A quick exhaust"'valve 550 is interposed in the line 546.

I High pressure air in the line 544 operating through a time delay valve 552 interposed in this line forces a springpressed plunger 554 against a plunger 556 of an impulse switch 558 which is connected to one of a pair of then unbridged terminals 560 of the switch 538.

When it is desired to tunnel the wedge heel block 34 I by roughing and finishing cuts in accordance with the Icycle or sequence of operations No. 2 the lever 496 of the switch 494 is moved to a position in which it bridges 7 contacts 492, 498 of this switch, the plunger 514 of the block 34 during retraction of the carrier on thesupporting block. 1 'With the switches 494, 510, 442 and 538 set as above described and as illustrated for sequence-of operations No. 2 in Fig. 12, the operator presses the knee pad 31 8 causing, as above explained in describing the-sequence of operation No. 1, the clamp to secure the wedge heel block positioned on the carrier 36 to said carrier, the

breast gage 180 to be lowered on the carrier, and the carrier to be moved'toward the cutter 42 causing the wedge heel block to be tunneled by a roughing cut to a predetermined shape or outline. As the carrier 36 reaches the end of its movement into the cutter 42 the striker plate 114 engages the plunger 440 of the impulse switch 441 causing, through the switch 442, the terminals 562 of which are bridged by the plunger 444, the coil 516 of the solenoid valve 518 to be energized and accordingly the slide 520 of this valve to move to the left as viewed in Fig. 12 to its dash-line position causing high pressure air from the line 522 to be available for the face 528 of the piston and the face 548 of the piston to be open to an exhaust line 564 with the result that the carrier 36 is raised slightly to a height determined by the engagement of the nut 504 with the bottom of the cylinder 56.

Simultaneously with the upward displacement of the carrier 36 high pressure air in the line 524 passes through the time delay valve 532 and causes the spring-pressed plunger 534 to operate the impulseswitch 536 thereby energizing, through the switch 538, the coil 446 of the solenoid valve 426'with the result that the slide 428 of this valve moves to its full line position shown in Fig. 12 causing high pressure air to be available for the face 436 of the piston 248 and the carrier 36 to be moved to its retracted position on the supporting block 74. As the carrier 36 approaches the end of its movement on the supporting block 74 to the right, as viewed from the front of the machine, the striker plate 114 engages the plunger 110 of the impulse switch #106 causing, as above explained in describing the sequence of operations No. 1 of the machine, the unelamping of the tunneled wedge heel block 34a from the carrier, the operation of the ejector 224 and the raising of the breast gage 180 to its starting position. As the carrier 36 reaches its retracted position on the supporting block 38 the striker plate '114 also engages the plunger 112 of the impulse switch 108 causing through the selector switch 494 the coil 541 of the solenoid valve 518 to be energized, the slide 520 of this valve to be moved to the right (Fig. 12) to its fullline position, and accordingly air at high and low pressures to be available for the faces 548, 528 respectively of the piston 60 to move the carrier 36 to its lowered starting position.

When it is desired to lower away from the cutter 42 :the carrier 36 and the tunneled wedge heel block 34a secured thereto at the end of the tunneling movement of :the wedge heel block into the cutter, the machine being the terminals 540 of this switch. When the machine setup for a sequence o-foperations No. 2 comes to rat, the

piston 60 engages the lower end of the cylinder 56 by reason of the coil 541 of the solenoid valve 518 having been enrgized at the end of the preceding cycle. It will also be noted that when the machine is set for the sequence of operations No. 2 the nut 504 is initially adjusted to a predetermined position upon the rod 502, the space between the bottom face of the cylinder 56 carrier 36 to its projected position on the supporting block 38, this distance being equal to the thickness of material which, is to be removed from the wedge heel adjusted initially to carry out its sequence of operations No. 3, the lever 496 of the switch 494 bridges the terminals 49 2, 500 of this switch and the plungers 514, 444, 542 of switches 510, 442, 538 respectively bridge terminals 540, 562, 560 of these switch'es.

Assuming that the machine has been idle but is set for sequence of operations No. 3, the operator, after powering the machine by closing the power switch 341, temporarily moves the plunger 514 of the switch 510 across terminals 512 of this switch and then moves the plunger and the nut being equal to the distance that the support-. ing block 74 is raised at the end of the movement of the 506 of the normally open switch 508 across the terminals of this switch thereby energizing the coil 516 of the solenoid valve 518 and thus causing by the operation of mechanism above described the piston 60 and according the carrier.36 operatively connected to the piston to move to a raised position determined by the engagement of the initially adjusted nut 504 mounted on the rod 502,

which is secured to the piston, with the bottom of the switch 314 and accordingly to operate in succession the clamp 116, the breast gage 180 and the carrier 36, the heel .block positioned and clamped on the carrier being moved into or traversing the cutter 42 to form the tunnel 30 in said heel block. As the carrier 36 reaches the end of its movement into the cutter 42 the striker plate 114 mounted on the carrier engages the plunger 440 of the impulse switch 441 causing through switches 442, 510 the coil 541 of :the solenoid valve 518 to be energized and the slide 520 of this valve to move back to itsfull-line position-shown in Fig. 12 with the result that the piston 60 is lowered until it engages the lower end of the cylinder 56. Simultaneous with the lowering of the piston 60 high pressure air is supplied through the line 544 to the time delay valve 552 causing the spring-pressed piston 554 to be forced against the plunger 556 of the impulse switch 558. Operation of the impulse switch 558 causes through the switch 538 the coil 446 of the solenoid valve 426 to be energized whereby to move the slide 428 of ,this solenoid valve to its full-line position in which high pressure air is available for the face 436 of the piston 248, the face 4380f the piston beingopen to exhaust. As

the carrier 36 approaches the end of its retracted movement on the supporting block 74 the striker plate 114 engages the plunger 110 of the impulse switch 106 causing the coil 452 of the solenoid valve 348 to be energized, the solenoid slide 346 being moved .back to its fullline position shown in Fig. '12 causing the clamp 116 to be raised. As above explained the elevating of the clamp 116, through means above described, operates the ejector 224 to remove the tunneled wedge heel 34a from'the .carrier 36 and thus raises the breast gage 180 to its starting position. Immediately after operating the switch 106 ,the striker plate 114 engages the plunger 112 of the impulse switch 108 causing through the switch 494 the coil 516 of the solenoid valve 518 to be energized with the result that the slide 520 of this valve is moved to its dash-line position shown in Fig. 12 in which high pressure air is available for the face 528 of the piston 60, the face 548 of said piston being open to exhaust and the piston moving to its raised starting position determined by the engagement of the initially adjusted nut 504 with the bottom of the cylinder 56.

When initially trying out the operation of the clamp 116 thebreast gage 180 and the ejector 224 it is desirable to eliminate the feeding of said carrier, and accordingly the machine is provided with the switch 422 which may be opened for this purpose. In order readily to lift the clamp 116 during the setting up of the machine there is provided aswitch 566 connected to the coil 452 of the solenoid valve 348. During the operation of the machine it is sometimes desirable that the carrier 36 shall be immediately returned to its starting position on the sup port 38' and accordingly the above-mentioned impulse switch ,326 is provided, this switch being quickly operated by moving the knee pad 318 (Fig. 5) counterclockwise until the nut 338 engages the angle bar 324.

When it is desired to provide the wedge heel block 34 with the modified tunnel 30a (Fig. 9) for example the main cam 78 is replaced by the cam 78a an upper surface 122a of which is provided with a projecting portion 568 adapted to raise the carrier 36 as it travels along said upper surface. The action of the cam 78a in forming the tunnel 38a will be apparent from an inspection of Fig. 9.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a wedge heel tunnelling machine, a cutter rotatable about an axis, power means adapted to move, in one general direction in a predetermined path, a wedge 14 heel block lengthwise against the cutter to form by roughing cuts a tunnel in thetforward part of the bottomof said block, power means responsive to movement of the heel block to a predetermined position in said one direction in-said pathfor automatically effecting areia- .tive movement of approach between the cutter as an entirety and the heel block at a substantial angle to said path, said first named power means thereafter moving the heel block against the cutter in a direction opposite to said one direction in a path which is contiguous to the first-named path whereby to formin said forward part of the heel block by finishing cuts a tunnel which is substantially similar to but deeper than the first-named tunnel.

2. In a machine for tunneling wedge heel blocks, a cutter rotatable about a fixed axis, a carrier, means for positioning a wedge heel block on the carrier, said means comprising a breast gage adapted to be engaged by the breast of the wedge heel block, said breast gage being movable on said carrier between block receiving and retracted positions, power means for clamping the positioned heel block against the carrier, power means operative in response tooperation of the first-named power means for automatically moving the breast gage from its block receiving to its retracted position, and power means for automatically moving the carrier in a predetermined path extending generally lengthwise of the block whereby to cause said block lengthwise to traverse the cutter to form a tunnel at the forward part of the bottom of the block. I l

3. In a machine for tunneling wedge heel blocks, a cutter rotatable about an axis, a carrier, means adapted to position a wedge heel block on the carrier and comprising a lip gage having a face adapted to be engaged by the forward portion of the attaching face of the heel block and a breast gage adapted to be engaged by the breast face of said block, said breast gage being movable between a heel block receiving position in which said gage extends a substantial distance beyond the supporting face of the lip gage and a retracted position in which the gage extends a slight distance above said supporting face, power means for clamping the positioned wedge heel block in the carrier, power means responsive to movement of said power operated clamping means for moving the breast gage from its heel block receiving to its retracted position, and power means for thereafter moving the carrier in a predetermined path whereby to force the heel block against the cutter to form a tunnel in the forward portion of the bottom of the heel block.

4. In a machine for use in the manufacture of wedge heels, a rotary cutter, a movable carrier for a heel block, a unit which is movable to different active positions and is adapted to support and to guide the carrier, means for positioning a heel block on the carrier, a clamp, power means for forcing the clamp against the positioned heel block mounted on the carrier, power means operative in response to operation of the clamp for moving with relation to the cutter on said unit set in one operating. position the carrier from a starting position to a projected position in a predetermined path to cause material to be removed from the block by roughing cuts, and power means responsive to movement of the carrier to its projected position in said path for moving said unit transversely of said path to a second operating posi' tion, whereby to cause the heel block to be forced into the cutter, and also for moving the carrier on said unit in a direction opposite to said one direction to cause material to be removed from the block by finishing cuts.

5. In a machine for use in the manufacture of wedge heels, a rotary cutting tool, a carrier for a heel block, a unit which comprises a cam and is movable to different active positions and is adapted to support and to guide the carrier, means for positioning a heel block on the carrier, a clamp, power means for forcing the clamp against the positioned heel block mounted on the carrier, power means operative in response to operation (of-the clamp for moving in a predetermined path deter mined by the cam with relation to the tool on said unit set in one operating position the carrier from'a'starting position to a projected position whereby to cause material 'tobe trimmed from the blockby roughing cuts, and power means responsive to movement of the carrier to its projected position for moving said unit transversely of "said path to a second operating position, whereby to force the heel block against the cutter, and also for nioving the carrier on said unitin a second direction opposite to said one direction to cause material to be f'removed from the block by finishing cuts, said last-named power means being responsive to movement of the carrier in said second direction for moving said unit back to'said one operating position.

-6. In a machine for use in the tunneling of wedge heel blocks, a cutter rotatable about an axis, a carrier, a unitcomprising a supporting cam and a guideway which are yieldingly secured together and are adapted to control movement of said carrier on the unit in a predetermined path disposed at substantially right angles to the axis of the cutter, means for positioning the wood heel block on the carrier with its lengthwise dimension ext-ending generally lengthwise of said path, means for clamping the positioned block on the carrier, power means operative in response to the operation of said clamping means for moving toward the cutter on said junit arranged in onesetting the carrier to which the block is clamped in one direction along said path to a,

predetermined position whereby to form by a roughing cut-"a tunnel at the forward portion of the bottom of said block, power means responsive to movement in said ;one direction of the carrier to said predetermined position for moving at right angles to-s'aid path the unit to-,

wardsaid axis to a second setting and for limiting move 'ment of'the carrier in said one direction and for moving the carrier on the unit in a direction opposite to said one direction whereby to increase by finishing cuts the depth of the tunnel at the forward portion of the bottom of the wood heel block. i 7. -In a wedge heel tunneling machine, a cutter rotatable about a horizontal axis, a carrier for a-wedge heel block, a unit for supporting the carrier and for guiding it for movement in opposite directions in a horizontal path dispreliminary setting and for moving the clamp away from posed at substantially right angles to the axis of the cutter, 1

' said unit being mounted for movement in opposite directions in a vertical path disposed at substantially right angles to the axis of the cutter and to the path of movement of the carrier on said unit, power operated means for moving on said unit the carrier in said opposite directions in said horizontal path, and power operated means rendered active in response to movement of the carrier on the unit to the ends of its movement in opposite directions in said horizontal path for moving said unit in opposite directions respectively in said vertical path. 7

"8. In a wedge heel tunneling machine, a cutter rotatable about an axis, a carrier for a wedge heel block, a unit for supporting the carrier andfor guidingit for movement in opposite directions in a horizontal path disposed at I substantially right angles tothe axis of the cutter, said'unit being mounted for vertical movement in opposite directions in a vertical path disposed at right angles to the axis of the cutter and to the path of movement of the carrier on said unit, power operated means for moving the carrier 6 'in' said opposite directions in said horizontal path on said" unit, power means rendered active in response to movement of the carrier on said unit to the ends of itsmovement at opposite directions in said horizontal path for moving said unit in opposite directions respectively in said vertical path, and means for'selectively controlling the directions of the vertical movements of the unit at the ends respectively of the horizontal movements of the "carrier on said unit. i I

9. In a machine for use in the manufacture of wedge heels, a cutter rotatable about an axis, a carrier, a guide unit for supporting and guiding the carrier, first power means for moving the guide unit to a preliminary setting, aside gage for positioning a Wedge heel block widthwise onthe carrier, a breast gage movable on the carrierbetween block receiving and retracted positions and adapted to be engaged by a breast of the heel block to position the block lengthwise on the carrier, a clamp, a manually actuated member, second power means rendered active in response to movement of said member and adapted to force the clamp against the block positioned on the carrier, third power means for moving on the guide unit the carrier in a predetermined path disposed at right angles to the axis of the cutter, fourth power means responsive to movement of the clamp for moving the breast gage from its block receiving position to its retracted position on the carrier and for initiating operation of the third-named power means to move said carrier in one direction toward the cutter in said predetermined path from a starting position on the guide unit in its primary setting whereby to cause said heel block to traverse lengthwise the cutter to form by roughing'cuts a tunnel at the forward part of the bottom of the wedge heel block, fifth power means responsive to movement of thecarrier to a predetermined point in said one direction on said guide unit for automatically 35 moving the guide unit at substantially rightangles to the path of movement of the carrier on said unit whereby to move said unit to a secondary setting and also for causing said third power means to effect movement of the carrier on the. guide unit in a path which is contiguous to said first named path whereby to cause said carrier to return to its starting position on said unit and to cause material to be trimmed from the tunnel by finishing cuts, sixth power meansresponsive to movement of the carrier to a predetermined point in said contiguous path on the guide unit for automatically moving the guide unit back to its the block, an ejector mounted on the carrier, and seventh power means responsive to movement of the clamp away from the block for causing the ejector to remove the block from the carrier and for thereafter moving the breast gage back to its block receiving position on the carrier.

References Cited in the file of this patent UNITED STATES PATENTS Y of 1929 

